Finding a middle ground between the two is ideal. You want frames that flatter you, but you also want ones that reflect your personal style.

To help you navigate this spring's crop of sunglasses, we talked with experts from two of the biggest players in the eyewear industry: Neil Blumenthal and Dave Gilboa, the co-founders and co-CEOs of Warby Parker, and Alessandro Mariani, the senior brand director for Ray-Ban in North America.

Using face shapes as a jumping-off point, we're introducing you to some of our favorite shades of the season, and providing advice on how to make any pair work for you — even if they're not the ones we've paired with your shape. All three experts agree you should feel free to shop other categories.

"Contrary to popular belief, there are no hard and fast rules [for picking out sunglasses]." Blumenthal and Gilboa told Business Insider. "Our ultimate guideline is to wear comfortable frames that make you feel good. But, if you want some tips for picking out a pair, think 'juxtaposition'. A strong, distinct square frame works best for a round face, while a rounder frame with a softer edge complements a more angular face."

Mariani concurs and adds that sunglasses are "practical accessories that should look good as well as protect eye health." He provides more details on five of the most common face shapes — square, triangle, round, oval, and heart — and frames to complement each in a moment.

If you have a heart-shaped face, look for sunglasses with thin or light metal frames

MR PORTER

Indicators: Heart faces are broad at the forehead and cheekbones, and narrow at the chin.

Sunglasses to try: To broaden the appearance of the chin and draw more proportion throughout the face, try thin, light metal or clear plastic frames that have broader bottom halves. Stay away from big, heavy glasses, which will draw attention away from the best features.

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